validation: clamp low_high test must reference the test function (#3899)

The clamp validation test creates a 'foo' function that contains
code to be checked.  The entry point must call 'foo' in order
for those override expressions to be checked.

Bug: crbug.com/351378281

src/webgpu/listing_meta.json

@@ -862,14 +862,14 @@
   "webgpu:compat,api,validation,encoding,programmable,pipeline_bind_group_compat:twoDifferentTextureViews,render_pass,used:*": { "subcaseMS": 0.000 },
   "webgpu:compat,api,validation,render_pipeline,depth_stencil_state:depthBiasClamp:*": { "subcaseMS": 1.604 },
   "webgpu:compat,api,validation,render_pipeline,fragment_state:colorState:*": { "subcaseMS": 32.604 },
-  "webgpu:compat,api,validation,render_pipeline,vertex_state:maxVertexAttributesVertexIndexInstanceIndex:*": { "subcaseMS": 3.700 },
   "webgpu:compat,api,validation,render_pipeline,unsupported_wgsl:interpolate:*": { "subcaseMS": 3.488 },
   "webgpu:compat,api,validation,render_pipeline,unsupported_wgsl:sample_index:*": { "subcaseMS": 0.487 },
   "webgpu:compat,api,validation,render_pipeline,unsupported_wgsl:sample_mask:*": { "subcaseMS": 0.408 },
   "webgpu:compat,api,validation,render_pipeline,unsupported_wgsl:textureLoad_with_depth_textures,computePipeline:*": { "subcaseMS": 1.259 },
   "webgpu:compat,api,validation,render_pipeline,unsupported_wgsl:textureLoad_with_depth_textures,renderPipeline:*": { "subcaseMS": 1.259 },
   "webgpu:compat,api,validation,render_pipeline,unsupported_wgsl:unsupportedStorageTextureFormats,computePipeline:*": { "subcaseMS": 1.206 },
   "webgpu:compat,api,validation,render_pipeline,unsupported_wgsl:unsupportedStorageTextureFormats,renderPipeline:*": { "subcaseMS": 1.206 },
+  "webgpu:compat,api,validation,render_pipeline,vertex_state:maxVertexAttributesVertexIndexInstanceIndex:*": { "subcaseMS": 3.700 },
   "webgpu:compat,api,validation,texture,createTexture:depthOrArrayLayers_incompatible_with_textureBindingViewDimension:*": { "subcaseMS": 12.712 },
   "webgpu:compat,api,validation,texture,createTexture:format_reinterpretation:*": { "subcaseMS": 7.012 },
   "webgpu:compat,api,validation,texture,createTexture:invalidTextureBindingViewDimension:*": { "subcaseMS": 6.022 },

src/webgpu/shader/validation/expression/call/builtin/clamp.spec.ts

@@ -187,6 +187,7 @@ fn foo() {
         code: wgsl,
         constants,
         reference: ['o_low', 'o_high'],
+        statements: ['foo();'],
       });
     }
   });

src/webgpu/shader/validation/shader_validation_test.ts

@@ -119,9 +119,14 @@ export class ShaderValidationTest extends GPUTest {
     constants?: Record<string, GPUPipelineConstantValue>;
     // List of additional module-scope variable the entrypoint needs to reference
     reference?: string[];
+    // List of additional statements to insert in the entry point.
+    statements?: string[];
   }) {
     const phonies: Array<string> = [];
 
+    if (args.statements !== undefined) {
+      phonies.push(...args.statements);
+    }
     if (args.constants !== undefined) {
       phonies.push(...keysOf(args.constants).map(c => `_ = ${c};`));
     }